Adafruit TMP119 High-Precision ±0.03°C I2C Temperature Sensor - STEMMA QT / Qwiic

The TMP119 sensor IC itself operates from 1.7V to 5.5V. The Adafruit breakout board is designed to be compatible with both 3.3V and 5V logic systems. You can power it directly from the 3.3V or 5V pins of your microcontroller, such as an Arduino or Raspberry Pi, via the STEMMA QT/Qwiic connector or the breakout pins.

For the easiest connection, use a STEMMA QT or Qwiic compatible cable to link the sensor directly to a compatible host board like an Adafruit QT Py or SparkFun Qwiic shield. For standard microcontrollers, you can solder the included header and connect the board's VCC, GND, SDA, and SCL pins to your system's corresponding I2C bus lines. The alert/interrupt pin is also broken out for advanced triggering.

No, the TMP119 sensor has a fixed I2C address. According to the Texas Instruments datasheet, the 7-bit I2C address is 0x48 (hexadecimal). If you need multiple sensors on the same bus, you will require an I2C multiplexer to manage communication with individual devices.

The alert (ALERT) pin is an open-drain output that can be configured to trigger when the measured temperature exceeds a user-programmed high threshold or falls below a low threshold. This allows your microcontroller to enter a low-power sleep mode and wake only when a temperature event occurs, or to immediately flag an out-of-spec condition without constantly polling the sensor.

Yes, the TMP119 is designed for high-precision applications. Its ±0.03°C typical accuracy, 16-bit resolution, and support for NIST traceability make it a strong candidate for secondary calibration standards, environmental monitoring in test chambers, and precision measurement systems. However, always verify its specifications against the specific requirements and standards of your end application.